Ooof--I have been trying to figure out how to STOP seeing that warning as it's phrased. I don't want to see homeowners and hacks pruning during spring months, but feel strongly that qualified professionals can safely prune oaks year round. The message we should be getting out is, hire a qualified company to do work on your oaks, at least during the spring. Unfortunately, all of this does not readily boil down to a handy sound bite the way "Do not prune" does, so I fear I face an uphill climb.
This assumes the qualified pros will be cognizant of the type of pruning they will do. If a branch is rubbing someone's roof, or a low branch is likely to get broken by a passing truck, and I can eliminate that really ugly wound with a neat collar cut, I am all over it. If someone planted 10 live oaks 2 years ago and wants a lot of structural pruning, I will definitely delay that until the pheromone cloud it creates will not be so likely to attract spore-toting beetles.
If we reach a point of a mandatory pruning ban during the spring (which has already been proposed in Austin and enacted in nearby Rollingwood), we will see law-abiding pros sit on their hands for four months (most Austin clients have oaks) while hacks will ignore the ban, which will get enforced spottily at best, I am sure. The management of this devastating disease will be placed in the hands of the least qualified people, and the problem will likely get worse, not better.
Where are you, Jody? Though this site hits the "Do not prune" message hard, I find it to be a good source of info on OW generally:
http://www.texasoakwilt.org/